Are you wearing a hat? My baseball cap did triple duty by keeping my pate
from getting sunburned, providing a sunshade for my eyes and making the
headset grip better.
Also, my seat was not too thick so my head/headset did not touch the window
unless I leaned. And, with the flat windshield, the airstream gets flung a
few inches higher than with the bubble windshield, thus, I had no problem
with the open-window wind pulling off my hat or headset.
Never had a problem at all with my old Telex HearDefender headsets.
Ed